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2 Sheets-Sheet 1.

(No Model.)

H. THAU.

MAGNETO CALL.

Patented Dec. 18, 1883.

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WITNESSES ATTORNEYS.

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(No Model.) 2 Sheets-Sheet 2.

H. THAU.

MAGNETO CALL. No. 290,495. Patented Dec. 18, 1883.

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Unirni) STATES PATENT HENRY THAU, OF NEW YORK, X. Y.

MAGNETO CALL.

SPECIFICATION forming part of Letters Patent No. 290,495, dated December 18, 1888,

Application filed March 17, 1853. (No model.)

T0 (0 whom, it may concern..-

.Be it known that I, HENRY THAU, of the city, county, and State of New York, have invented a new and Improved Magneto Call, of which the following is a full, clear, and exact description.

My invention relates to the class of callsignals in which magneto-electric machines are employed to generate a current for ringing bells to make signals at distant points; and it consists in a series of knobs or lever-pulls provided with springeontacts, which close the circuit leading to the bell on the particular floor or at the room or station to be signaled when the magneto-electric machine begins to be rotated by drawing the knob or pull.

In the accompanying drawings, Figure 1 is a rear elevation, and Fig. 2is a side elevation, showing my improvement applied to an ordinary straight door-pull. Figs. 3 and A: show the improvement applied to alevcnpull. 5 shows the electrical connections with the different signal-bells.

Identical parts in the different figures are represented by the same letters of reference.

The magnetoelectric machine A is of the usual well known description, consisting of the permanent U-magnets a, having polepieces (Z, between which revolves a- Siemens bipolar armature, 0, having one terminal of its wire connected with the armature-shaft, while the other terminal communicates with an insulated pin, (1, extending through one of the journals of the armature.

Supported on the magneto-electric machine A, Figs. 1 and 2, by two arms, 0, there is a shaft, B, carrying at one end a toothed sector, 0, which engages the pinion f on the shaft of the armature c, and on each end of the shaft B there is an arnng. A red, 71, extends through the arm g, and is engaged by hooks i, jointed to the rodsj, attached to the pull-knobs 7;. The hooksi are pressed down into engagement with the rod h by springs I, attached to the rods j. A notch, m, terminating in an incline, n, is formed in the rod j, and above the rod j are supported two contact-springs, 0 p, by the insulating-block 9'. To the lower sprin 1), is secured a block, q, of insulating material, which rests in the notch m in the rod j. Xormally. the contactsprings 01) are not in contact with each other.

Referring more particularly to Fig. 5, the circuit is from the ground-wire s, spring 2, pin (1, wire of the armature c, and frame of the magneto-electric machine, wire a, contact spring p,- spring 0, and wire 2, to a distant bell, 1 or 2, having one of its terminals grounded.

The principal use of this call is for door bells in flats and tenement-houses. There will be as many pull-knobs 7. as there are suites of apartments; but only one magneto-electric machine will be needed for any number of floors or apartments. The knob belonging to any apartment controls the wireleading to that apartment, and when it is pulled completes the circuit from the magneto-electric machine to that apartment by the engagement of the inclined surface 21 with the block (1 on the spring 1). This raises the spring p and brings it into contact with the spring 0, where it remains during the outward and inward movement of the rod j,and until theinsulating-blockq drops into the notch m. The knob 76 is pulled outward against the pressure of the spring D on the shaft 13, which returns the parts to their normal position when the knob is released. The outward movement of the knob swings the toothed sector 0, which revolves the armature c of the magneto-electric machine, thus creating a current which rings the hell on the wire connected with the contact-spring o. The retractive movement of the parts also generates a current, which causes the bell to ring.

In the call shown in Figs. 3 and at a shaft, 13, carries at one end a toothed sector, (,held in its normal position by a spring, D. This sector 0 engages the pinionf of the magnetoelectric machine. Several lever-pulls E are placed loosely on the shaft 13, and are notched in the side of their bosses to receive the pins 20, projecting from the shaft 13'. The notches in the bosses of the levers are of sufficient width to permit one of the levers to turn the shaft without moving the other levers, the levers not depressed being held in an elevated position by springs a. Each lever E carries a cam, Z), of insulating material capable of raising the lower contact-sgring, p, and com- IOO 2. In a magnetoelectric call, a pull having an inclined or beveled shoulder for operating contact-springs, the toothed sector and mag- 15 neto-electric machine, in combination With the circuit-wires and contact-springs, arranged as shown and described, to operate as specified.

pleting the electrical circuit whenever the lever is depressed. At the same time the sector 0 turns the armature of the magneto-eleci tric machine and the current passes to the bell I 5 at the distant point. \Vhat I claim is- 1. The combination of two or more pulls i and a corresponding number of pairs of elec- HENRY THAIT. trical contactpoints with a magneto-electrical i 10 apparatus, a series of alarms, and wires suitably connected to establish the necessary cir- 1 cuits, substantially as shown and described.

\Vitncsses:

G150. M. Hormxs, O. SEDGWICK. 

